code: def initialize(context):
      context.i = -1  # minute counter
      context.exchange = list(context.exchanges.values())[
          0
      ].name.lower()
      context.quote_currency = list(context.exchanges.values())[
          0
      ].quote_currency.lower()
  
file_path: catalyst/catalyst/examples/simple_universe.py
imports: from datetime import timedelta
  import numpy
  import pandas
  from catalyst import run_algorithm
  from catalyst.api import symbols
  from catalyst.exchange.utils.exchange_utils import get_exchange_symbols
label_desc: Use image node_id 1 for calling a global function with example usage: initialize(context) without return types